Rumours do swirl, don't they. Wouldn't be surprised if nothing comes of them, but it wouldn't be all that surprising if they were true either. Carmarthen East & Dinefwr is Rhodri Glyn Thomas (remember him?)'s seat on the Assembly and it wouldn't be a massive surprise if he's sick of politics now. Though maybe there are rumours about other places; I've no idea. I don't really follow the rumours now, got sick of them after the Rainbow nonsense.
Whilst discussing the upcoming Welsh Lib Dem leadership election with a friend, I found out that is indeed likely to happen but not before the next Westminster election but before the next Assembly election.