Adewale Akinnuoye-Agbaje looks keen to return to Craphole Island. Talking to EW at the premiere for G.I. Joe (sidenote; seriously? This was a better choice than staying on Lost? Ok….) the former Mr Eko said that fans should remain hopeful of seeing their favourite god-bothering drug-runner in one form or another in S6, stating:
“Adewale is open for business. We have had talks about some things they might do for the final season and there are other dead folks coming back allegedly but at the moment it is still a maybe. A strong maybe but I have not shot anything yet or signed any contracts. But I’m hoping.”

"Yeah, it's spelt A-D-E-W-A..."
Those dead islanders already confirmed for appearances in S6 include Juliet (Elizabeth Mitchell), Faraday (Jeremy Davies), Boone (Ian Somerhalder) and Claire (Emilie de Ravin).
It’ll certainly be interesting to see how they bring back these characters; I initially assumed they might be forms taken on by the Smoke Monster/Jacob’s Enemy but considering the finale of S5, could the Incident have succeeded in changing history? What if S6 opens with Oceanic 815 making a safe, uneventful landing in Los Angeles with only those characters present at The Swan aware that time has changed? All just speculation at the moment (and if there are spoilers out there, please keep them to yourselves!)

craphole island?…
you weird cunt.