Upcoming anime episodes 426-429 will be anime-only episodes related and making background to Movie 10.
All those who are having intrest on upcoming One Piece movie should check them out even if you are manga only viewer.
Since Movie 10 has been based on Oda's transcription I guess Oda has been involved giving advices on making these episodes.
Quote:
426 "Special Linked to the Movie - The Golden Lion's Ambitions Start to Move"
"Eiga Rendō Supesharu - Ugokidasu Kinjishi no Yabō" (映画連動特別編 動き出す金獅子の野望) November 15, 2009 —
427 "Special Linked to the Movie - Little East Blue Targeted"
"Eiga Rendō Supesharu - Nerawareta Ritoru Īsuto Burū" (映画連動特別編 狙われた小さな東の海) November 22, 2009 —
428 "Special Linked to the Movie - Fierce Attack of the Amigo Pirates"
"Eiga Rendō Supesharu - Amīgo Kaizokudan no Mōkō" (映画連動特別編 アミーゴ海賊団の猛攻) November 29, 2009 —
429 "Special Linked to the Movie - Decisive Battle! Luffy vs. Ralgo"
"Eiga Rendō Supesharu - Kessen! Rufi VS Rarugo" (映画連動特別編 決戦！ルフィVSラルゴ) December 6, 2009 —
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So episodes 426-429 will be fillers that are linked on upcoming Movie 10.
Also Movie 10 villain has been mentioned in Manga aswell.