It appears that winter is the new summer for the Lupin franchise; 2009 saw the crossover special air in March. February 12 will see the 2010 special air as announced by the Mainichi Shimbun (Japanese); titled The Last Job, the plot revolves around a Japanese artifact found in a Nazi sanatorium. A band of ninjas led by Morgana battle against Lupin for this treasure; the big twist is Zenigata will supposedly die at Morgana's hands.
Already, fandom is buzzing that this will be a turning point in the franchise, and this time they could be proved correct. Naya Goro, Zenigata's voice actor, has not been in good health or voice in recent years; he could be retiring leaving a large and unique hole to fill in the cast. The question remains if the writers can introduce a new antithesis for Lupin that the audience will embrace.
Then again, they replaced Lupin's voice with a similar one and kept the character going; maybe they have plans to do the same for Zenigata. A new direction for the franchise or just another stale gimmick (cf. $1 Money War as one example)? We'll find out in two months.