I'm sure it will have additional capabilities somehow, but I don't think it'll be vastly different from her previous one. Allen's hand is still a hand that's a more advanced version of his old weapon. Lenalee's boots have worked well for her so far. Additionally, Allen had to reform his Innocence entirely and was aware of it; as far as Lenalee knows, if she's going to invocate her Innocence, it'll be boots as it always has been (except possibly as a parasitic-type this time). Even though she may have the potential to have something different, she probably doesn't expect it.The Innocence thing is once again up for grabs. Remember Allen had to re-form his hand, not by seeing a hand, but by seeing the tools it would be used as to destroy Akuma. Only after the weapon was re-forged did his hand reform. I'm saying that if it is a case simular to Allens, Lenalee might picture a weapon totaly diffrent then what she had before, or something with additional protection or attack capabilities.
Of course, extra things would be damn awesome. Skirt upgrade! (Or maybe I've been watching Sailor Moon too much.)
That seems to be a basic ability of parasitic-types (if Allen was any indication in the first volume), so that'll almost certainly happen. xDSorry, new though... what if in addition to the original capabilites she gained one to nullify the Akuma Virus from the Akuma's weapons and such? That would be interesting/handy depending on what her resolve is.