[JiraiyasTesticles]

*MANGA SPOILER*

Personally I think there is only three ways out:

1. Ichigo gets help from someone (most likely Grimjow).
2. Ichigo realises (much like chad) that something is different when he is in Hueco Mundo (he has already perfected his mask in a short time being there) and he finds out that his hollow side also has a release form.
3. Old man Zangetsu teaches Ichigo a new move, if you remember back Ichigo said that Zangetsu would only teach him one move but that he had more, so thats another possibility.

Personally I want it to be number 2 as its the only plausable way I can see Ichigo getting a power up, because as he is now his Bankai is useless and even if he beats Ulquiorra, there are a lot of people to go that are stronger than him.