Filed under: CellphonesAnother day, another Gphone rumor. This go 'round, a UBS analyst is reportedly confirming that HTC "will ship about 50,000 cellphones running on a mobile operating system made by the Mountain View, California-based search giant by the end of this year." If you'll recall, this definitely isn't the first time we've heard these two names mentioned in the same sentence, but interestingly enough, analyst Benjamin Schachter actually suggested that the first batch wouldn't "be for sale" -- rather, they'd be used exclusively by developers "to understand how the software works." These reports als