Depends on how you define relevant. Every year when they churn out a new android or apple device, it usually only means a marginally better screen, maybe a little bit faster processor, etc. But will these even be noticeable in the long (or short) run?
For me, the big questions are: can I make phone calls? send texts? access email/internet? The biggest concern for me is how long the modems will be supported by cell towers, and whether or not the move away from 3g will affect us. As long as the phones are technologically usable, I trust we will get enough software support to stay relevant.