Ohana has been removed and replaced with a brand new map, Bel'Shir Vestige (벨시르 잔재) by Crux_EastWindy. The map pool change will occur starting from Code S Round of 32.
2012 GSL Season 5 Map Pool (listed in order as specified in announcement)
GSL Cloud Kingdom
GSL Entombed Valley
GSL Antiga Shipyard
GSL Abyssal City
GSL Bel'Shir Vestige
New map: GSL Bel'Shir Vestige, by Crux_EastWindy
2 Player Map
Tileset: Bel'Shir (Jungle)
Starting locations at 5 and 11 o'clock
All expansions 8m 2g except for the central two expansions which are 5m 1g (standard yield)
Description (Translation from the announcement): Bel'Shir Vestige has main paths located on the two central hills with a faster road available through the center when the destructible rocks are destroyed. As the game progresses the Xel'Naga watch towers see increased usage so it is expected that engagements will occur focused on control of the center of the map, but as there are detours available one cannot become complacent even with such control. Battles in the center of the map between main armies as well as multi-pronged attacks through the detours can be expected from this map.
Source: kr.gomtv.net Forum Announcement, supplemented with details from the original map publication post on PlayXP