Some people will be glad to see a public acknowledgement along with an apology. Others will wish that had come bundled with some free points or a certificate of some sort as a means of compensation for the frustration (extreme in some cases) they've endured.
I personally just think it was an opportunity missed - a corporate message such as this should've at least included something tangible, such as firming up a hard date for the new program or something along that line. I would've liked to have finished reading that e-mail knowing something I didn't know going in.
But let's at least recognize that he didn't dismiss anyone as "fringe," he didn't claim that all systems are now a go in spite of clear evidence to the contrary, and he did in fact apologize - something that many around here have called for repeatedly.