I think the only way to get answers regarding contracts/number of pilots required/bases etc. is to apply and go through selection. Jet2 pilots certainly aren't privy to the big picture and anything said would be speculation.
I can say that the last round of pilot recruitment was for either temporary contracts (finishing end of Oct subject to extension) or permanent part time contracts (full time summer & off in winter for 70% salary). I don't know of anyone having been taken on for permanent full time contracts recently.