It is easy to guess a new model with same hardware may appear, like 3510, 3600 or whatever.
But does anyone have an information if NEC is developing or at least planning a new generation of DVDRW? I believe many people will wonder this. What if a 4100A is announced in 3 month and 3500A become out of NEC’s and firmware tweaker’s interest? (As an owner of 2500A, I believe it will gradually become out of interest in this forum from now on. But that’s the reality everybody has to accept.)