From my recent chat with @VerizonSupport on Twitter:
Hellstorm (me): @VerizonSupport Any chance of getting a DVR upgrade? I heard FIOS is coming out with new DVRs with more storage, new firmware, etc.
Verizon Support: @Hellstorm Hi Brian. Currently, there are no plans to upgrade existing customers. ShawnG
Hellstorm: @VerizonSupport So I can't bring my current DVR to a FIOS location & get a new one?
Hellstorm: @VerizonSupport Why aren't customers supporting FIOS for years entitled to the same DVR as new customers?
Verizon Support: @Hellstorm Unfortunately no.