After The International 2012, Zenith fell apart bit by bit,with Loda leaving the team and HyHy announcing his retirement, which has now turned out to be him switching to League of Legends. On top of that, iceiceice was standing in for Orange e-Sports during the G1-League and it was rumored to be a long-term engagement.
During the qualifiers for the World Cyber Games, Zenith played with two stand-ins who looked to be promising replacements, but it didn't work out as well, leaving xy-, freedom and iceiceice with a 3-man roster.
Mushi leaving Orange would be no surprise, seeing as there have been rumors of problems between him and YamateH.
There is no official statement yet, but according to joinDota, iceiceice confirmed Mushi's engagement with the Singaporeans.
UPDATE:
Statement by Orange e-Sports on Facebook:
We like to clarify that it is not yet confirm that Mushi will join Zenith. Orange Esports is fine tuning our DotA2 roster to deliver better results in 2013 for our fans and sponsors. Official announcement will be made over the next 2 weeks. Cheers
We like to clarify that it is not yet confirm that Mushi will join Zenith. Orange Esports is fine tuning our DotA2 roster to deliver better results in 2013 for our fans and sponsors. Official announcement will be made over the next 2 weeks. Cheers
Current (?) Zenith roster:
Daryl 'iceiceice' Koh (captain) Toh Wai 'xy-' Hong Nicholas 'xFreedom' Lim
Yee Fung 'Mushi' Chai Source: Wordpress