He arrives in a blaze of light and trumpets, but Jonathan Pryce’s King Lear seems as much charming, lovable father as imposing monarch as he sets about carving up his kingdom. What follows, though, brings a prickling sense of horror, as Michael Attenborough’s production lends a disturbing dimension to Shakespeare’s bleak tragedy.

With the American presidential election campaign now in full swing, the search is surely on for cultural expressions of the two nations that the candidates represent: white rich people versus the rest. Okay, maybe an exaggeration, but who says I’m unbiased? Anyway, a new play from Tarell Alvin McCraney, one of the most innovative black American playwrights of his generation, runs the risk of being seen as a metaphor for Obama’s first term in office. But does this burden the new play with too many expectations?

The Kander and Ebb musical Cabaret, inspired by the Berlin stories of Christopher Isherwood, is soon to return to the West End with Will Young. Its less well-known source is John Van Druten's 1952 play I Am a Camera. The title comes from the opening page of Goodbye to Berlin, Isherwood's memoirs published in 1939 inspired by his years in the capital of a country reeling from the last war and suffering from the global Depression: “I am a camera with its shutter open, quite passive, recording, not thinking.”

After years spent in the dark alleyways of abuse, where the only optimistic light is the sickly glow of neon, some new playwrights are emerging into the sunnier meadows of romantic comedy. The market leader must be David Greig’s delightful Midsummer (2008), which was also a love letter to the city of Edinburgh. Now, Phil Porter’s quirky romcom has come down from the Edinburgh Festival, ready to set metropolitan hearts a flutter and warm even the most cynical temperament.

Who says you can't go home again? American actor-singer Anthony Rapp does that, and then some, with his solo show Without You, in which one of the original leads of the Broadway musical Rent relives the passions and pain of an extraordinary time. Quite how the 80-minute piece will register with non-Rentheads (as the show's fans remain known) must be up for grabs.

Affairs, arguments, accidents. Feminism, marital failure and a fear of ageing. Jumpy has plenty of conflicts and issues, dunked in a wonderful bittersweet humour. But while April de Angelis faces uncomfortable truths, she fails to deal with them with equal courage. This play gnashes its teeth – at the gap in communication between generations and at the eternal pursuit of youth – but it lacks bite.

An erstwhile Broadway flop provides late-summer theatrical fascination in the form of Vieux Carré, the self-evidently flawed Tennessee Williams play from 1977 that nonetheless is worth seeing for anyone attuned to this playwright's singular articulation of abandonment and loss.

The fright wig is instantly recognisable. Even with her back turned, it’s obviously Tina Turner on stage. Except it isn’t. It’s actress Emi Wokoma playing the singer in a performance virtually guaranteed to turn her into a star. Casualty and EastEnders will soon be distant memories for Wokoma. Good for her, maybe, but she’s the best thing about the otherwise wafer-thin Soul Sister.

Since 2004, the Ambassador Group’s Trafalgar Studios has done sterling work in staging West End transfers for some of London’s most promising fringe talents. Kieran Lynn’s An Incident at the Border arrives in the centre of town from the Finborough Theatre, where it was seen in July. It has a good cast and, because of its sceptical attitude to the pervading aesthetics of naturalism in contemporary playwriting, lots of promise. But can it live up to expectations?

I, Tommy, Gilded Balloon ****

Everybody will be familiar with Tommy Sheridan's story, and not necessarily because they closely follow Scottish politics at their most internecine. Rather because the Glaswegian socialist went from being barely a paragraph in broadsheets to being plastered over the front pages of tabloids after a series of revelations – which he strongly denies – about visiting swingers' clubs.