I think the most recent carriers to have introduced long-haul first class are Turkish and Oman Air. Turkish took previous Jet Airways planes with their first class suites. I think also Royal Brunei recently planned to take a few such planes from Jet and thereby also introduce F, but that deal reportedly was abandoned and those planes are going to Thai instead.

Garuda is planning to introduce new aircraft with F in the near future I heard.

Hainan Airlines is mentioned above and indeed they took a few (3 I think) Cathay Pacific A340s with F but my impression is that Hainan is (oddly) selling these seats as business class despite being used on long-haul routes.

I have read about Kingfisher and Arik Air planning future long-haul aircraft with a real F product but it is probably uncertain if this will materialise.

On the opposite question, airlines who have abandoned F in recent years include South African, Air New Zealand, Eva Air, Varig (defunct) and most recently Philippine Airlines, LAN and Air Mauritius. In addition US Airways and Royal Jordanian have formally dropped F as a separate class but the old F seats are still on some planes sold as C. Recently, Gulf Air announced that they are also dropping F and during a transitional period the existing F seats are sold as a sort of premium C.

Airlines that may drop or reduce F in the near future (or so it is speculated anyway) include Air Tahiti Hui, Egyptair and China Airlines.

These developments still leave some 30-35 F players so this market is still alive despite the occasional predictions about its demise!