"One Piece: Long Ring Long Land Arc" is a One Piece special episode that recapped episodes 207-219 (the Long Ring Long Land Arc) and is said to have had new animation done for it instead of reusing pre-existing footage from the anime by those who watched it, there was no story change other than new animation being made.
The producer of One Piece had also promoted the special on the offical One Piece website [1] and stated that the special would air for one night only on FujiTV [2] on December 11th, 2015. The recap special itself would be a promotion for the special, "One Piece: Adventure of Nebulandia" which would air on December 19th, 2015.
There are few screenshots and no known recordings of the special as it was only a recap of an already existing story arc.
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2. One Piece producer promoting the special
3. Blog post of person who watched the special
4. The link where the special could be watched (No longer working)