I saw PUSH in MK in February, however the news that he was being retired did state IIRC that it was for good.
The contract with the company that owned PUSH expired and Disney didn't have any interest to renew as they continue to go in house for new in the park extras. It is a shame though, it was one of the magic little touches that has been there forever that I believe will make any Disney nerd sad to not see scooting around any longer.