Unsurprising, people have been wanting a larger iPhone for quite a while (and many "die hard" Apple fans actually moved away because they couldn't get one).
However that being said, take all "sell out" news (from anyone) with a huge grain of salt. It isn't unheard of to limit units to almost assure they run out, which increases hype and perceived scarcity. Need actual units sold to get an idea of how well it is doing (e.g. huge difference if AT&T had 3,000 units to sell and "sold out" or 1 million).
However that being said, take all "sell out" news (from anyone) with a huge grain of salt. It isn't unheard of to limit units to almost assure they run out, which increases hype and perceived scarcity. Need actual units sold to get an idea of how well it is doing (e.g. huge difference if AT&T had 3,000 units to sell and "sold out" or 1 million).