It all depends on how he lost. If this is close, competitive and remotely entertaining then I smell rematch, a shed load of money for all involved again but if WK is blown away then I think at top level he is done and he will retire. But even if it was devastating loss and he was going to retire I don't think it ends in the UK. I wouldn't rule out an easy fight to finish his career back in Ukraine. A celebration of his career all ending in his own country.
Back to back losses (should he lose) & a fairly close but deserved win over B level Jennings (a guy he would have demolished 4/5 years ago) in his last 3 is a yes from me. Though i respect him taking on all these undefeated contenders.. Time to hang em up champ.
No. There will be most likely a last fight for the German audience against Marco Huck, who wants to move up afer his last fight. Both are fighting on RTL, this fight will definetly be made for a last big payday and as a "goodbye fight" from both fighters.