Honestly, no one knows what the jail breaking community will be able to do in regards to iOS5. What we all are hoping is that they can jail break it right away (or at all!). Remember, it took them 3+ months to jail break the iPad2, and 4.3.3 was the only iOS version that could be/was jail broke.
For all we know, there is a jail break waiting in the wings for iOS 5 (just not released so Apple doesn't have a chance to "fix" the iOS). The key is, we just don't know.
All that to say - I would not count on having access to mouse operations on your iPad2 for November. It'd be cool to be pleasantly surprised, but ....
Cause no, there's no way to get mice to work on an unjailbroken iOS 4.3.5-running iPad2. None.
But, if I may say? Having an iPad running with Bluetooth keyboards - that's pretty cutting edge right there! The mice would be the icing on the cake, yes, but then, I think the iPad
itself is pretty high tech...and cutting edge.
Marilyn