Is this rook endgame won for white? In Dvoretsky's Endgame Manual, 2nd Edition from 2006 the following important practical rook endgame with a distant passed pawn is analysed. The whole analysis (of the same position with white to move and black to move) is on pages 194-200.

 [Title "White to move"] 
 [SetUp "1"]
 [FEN "8/R4p2/P4kp1/7p/7P/4K1P1/r4P2/8 w - - 0 1"]

 1.Kd4! Rxf2 2. Rc7 Ra2 3. a7 Kf5 4. Kc4!! {Johannes Steckner} Kg4 5. Kb3! Ra6 6. Rc4+ Kxg3 7. Ra4 Rxa7 8. Rxa7 Kxh4 9. Kc3 Kg3 10. Kd2 h4 11. Ke2 Kg2 12. Rxf7 h3 13. Rf2+! Kg3 14. Rf6 +-  


The author claims, with very long analyses to back it up, that white wins after Kd4!, but he warns:


  Nothing could be further from my mind than to label the analyses presented [...] as the "last word of theory" - long, complicated variations rarely turn out error-free.


Have there been any new developments since 2006?

I know 11-men tablebases are a long way off, but are we still confident this endgame is a win for white?
This entire endgame has been analyzed thoroughly on ChessPub. It seems that member Wes was right -> ...g5 is the main move. This was confirmed with a lengthy analysis at ChessCafe -> see the first position on the page ( there are some other games analyzed after the analysis of this position finishes ). I am sorry for posting links but the analysis is huge! 

Good luck and hopefully this answered your question!

Best regards!