Anyone interested in an MV should grab one for only one grand for sure!! It's easily worth double that if you're into MPCs / SPs and basically just dedicated hardware samplers that are able to do just about everything (you'd need). (Where's that 'make me a coffee' hardware expansion Roland? :-p )
I doubt there will be a new MV any time soon... as at least Roland itself doesn't seem to show any signs of wanting to discontinue their MV8800.
In fact, it took off quite slow, but is selling better than the MPC5k now. I'd be surprised if they'd pull the plug any time soon.
On the other hand, there's a couple of things I'd like to see on a new MV that would be worth upgrading.
I'm really not so sure which route Roland is planning to go when it comes to the impact of software and all that. Although I do love their take on the DAW-like environment inside the MV that's still totally dedicated to the hardware sampler side (contrary to a Maschine where they've turned things around).
More MV soldiers.
