I don't know how many ROM developers have 3000s on the way, or how long it may take to get a rom designed for the 3000. The unit's similarity to the 860 is going to ease the process, but the different processor, video chip and storage requirements mean that it isn't going to be a drop in replacement.
For the time being, I suspect that an English converted Sharp rom is definitely going to be the only option for the really early adopters.