The last show he did, If There Is I Haven't Found It Yet, which had him wearing an enormous beard and speaking with a Cockney accent, was off-Broadway, so this news marks his to-be Broadway debut - NYT says he'll star in Constellations, a play from the same writer as that earlier show which already played in London. Rafe Spall and Sally Hawkins starred in that production; I imagine there must be a sizable role for an actress if Sally was doing the show, so we should stay tuned to see who's co-starring with him then. Actually I don't have to imagine; here's the play's description from that previous website:
"One relationship. Infinite possibilities. A story of love, honey, and a quantum multiverse. Moment by moment, can everything you've ever and never done exist in the same vortex of reality? Elegant and playful yet profoundly moving, Constellations blends the everyday and the ethereal, the actual and the imaginable, revealing that every outcome may only be the first link in a chain of cosmic consequences."