The current party leadership have said that Corbyn will not be allowed to stand as Labour's candidate. Corbyn says he intends to go for it.

This market will resolve YES if Jeremy Corbyn is the Labour party candidate for Islington North (or any other constituency, but realistically it'd be that one) in the next general election. If he is not a candidate, or if he stands as an independent, it resolves NO.

See here for a conditional market on whether Corbyn will stand anyway as an independent (or other party):