Just finished a protracted series of emails with Carvin customer service.
Like pulling teeth to get anything substantive outta them.
I basically had to ask the same question about 5 times, each time simpler, to narrow in even a little on the 600 MHz.
Their first response: "We have no control over what the FCC may or may not do." I didn't find that especially helpful but I didn't give up. I won't bother with the details of the whole conversation, and I was moderately impressed that they even engaged in the conversation with me.
Cut to the chase: I told them I wanted to like the product and what could they do to convince me I wouldn't have a $400 paperweight in a year. (Okay, I'll include this detail, because it is indicative of the whole tedious conversation. His reply: "We'll do what we did last time." WHAT WAS THAT!?)
So he eventually said that last time (700 MHz grab) they had a trade-in deal - and he felt it necessary to continue that the previous program was no longer in effect. Did he think I was trying to put him on the hook for an ancient unit? I can't speak to his thought process... I thought I was pretty clear from the get-go I wanted to buy one and just needed to be convinced I wouldn't lose my whole big investment...
I don't expect the customer-service guys are tightly in the loop on new product development and future plans, but I know that in my company, if we knew a critical technology was headed for extinction in a year, we'd have a plan in place to have new products headed to the production pipeline as soon as the ink was dry on the decree... I didn't get that feeling here but like I said - he might not be in the loop...
Short version - worst-case - "probably" a trade-in program...