All year we've had to wait for a world premiere, and two come along at once. Last night was built to make some noise about the three most impressive young names in Royal Ballet choreography, and that will be where the PR story ends, but not where the flat disappointment ends. For while Christopher Wheeldon is shown at his magnificent best in an early piece, both Liam Scarlett and Wayne McGregor's new creations are nowhere near the best that either has shown.

An apocryphal story tells of an awful theatrical adaptation of the story of Anne Frank. When the Nazis arrive to search the house where the family are in hiding, an enraged theatre-goer shouts, “She’s in the attic!” Well, I didn’t quite point Anna Karenina to the train station, but the thought crossed my mind.

A few years ago, the word was that a new choreographer was showing interesting things. His name was Liam Scarlett, and although he was very young, some work that had been seen in a workshop was looking promising. It was not long before “promising” became actuality, and Scarlett’s first piece, Asphodel Meadows (main picture), was premiered on the Opera House stage.

What lies ahead for dance as arts spending cuts bite? Can it survive the withdrawal of public funds that support dancers' training, choreographers' creativity, employment costs and health care? Is protest necessary? A panel of the British dance world's leading figures was brought together by theartsdesk for a major debate last Friday in central London, as dance faced its own Question Time.

The cool physical activity of McGregor’s Limen, the crimson passions of Ashton’s Marguerite and Armand, the symbolic sculpture of MacMillan’s Requiem - the weekend's new triple bill at Covent Garden shows three faces of British ballet-making over the past half-century. While none is the masterpiece of its creator, together they describe an arc over time where lyrical emotion became replaced by gymnastic motion, compression by diffusion, individual idiosyncrasy by a kind of balletic collective.

The first half-hour of Edouard Lock’s nameless new piece is some of the most thrilling dance imaginable; dynamic, mercurial, as men and women convulsed with frenzy fight each other in stark spotlights in the dark. They’re dressed in black, so that each flail, each clash, each twitch of a pink pointe shoe trails an outline of blinding light and throws a flashing black shadow. Mile-a-minute in the dark, it’s terrifying.

Sylvie Guillem is back, chicken-skinny, middle-aged, dressed like a dowd. Did I just write that? And let’s add: as swift as mercury, as exact as a feather, as light as the sun, and as eternal in intelligent beauty as Nefertiti. In contemporary dance, as I was saying at the weekend, it should be permissible to sit in the dark wondering at the inexplicable and the unbelievable. This great ballerina of our era is both inexplicable and unbelievable, in physique and in temperament.

Programming a mixed bill is a very delicate art, and what seems like an interesting mix to one person might appear to be an entirely random series of choices to another. The Royal’s new triple is the perfect example. The music – Stravinsky, Poulenc, Stravinsky – might suggest an air of 1920s Parisian je ne sais quoi in theory, but in practice, that’s not how things unfold, with an odd combination of Ashton at his spiky chic-est, followed by Glen Tetley’s quasi-religious memorial meditation, and topped by Macmillan at his – well, more of that anon.

Nico Muhly at the piano, Stephen Petronio in a false beard, a storm-at-sea theme derived from The Tempest - how hip is that? I Drink the Air Before Me, a new work for the Stephen Petronio Company as the opening night of this year’s Dance Umbrella (the annual international modern dance fest that packs London’s venues for the month), had promise. The young composer delivered, the theme had its moments, but the picture above is a fiction - it’s a wish-list, as so many publicity stills for dance are, fine tailfeathers for dull birds. A couple of hours later I grope for my notebook to remember the choreography I saw last night.

Alvin Ailey dancers have been dancing about survival, grit, positivity and joy in the Lord for half a century now, and even though the parents of last night’s dancers may not have been born when Ailey did the unthinkable and launched a black dance company in the dark days of 1958 America, the company still evidently has an urge to rejoice running in its veins.