I mean, sigmarines are always going to be in the starter box. That was kind of the point of them. It is annoying, though I can't even be mad on behalf of other factions, GW's release rate has been pretty snappy of late, faster than even their own pipeline seems to be able to keep up with, and lots of factions have been getting some love. At least sigmarine releases seem concentrated at the start of editions, rather than taking up space over and over again like their 40k equivalents.
Honestly, if anything, I feel kind of bad for Stormcast players. Their rules are generally mediocre, and instead of ever seeing rules improvements to their existing units GW only ever seems interested in releasing new units that obsolete what came before.
Oh, well. Problems for other players. Vamp Counts are getting their own release wave this month, first stuff up on preorder the 15th.
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As for 3e itself, we'll see. They didn't get rid of the double turn, which is the worst thing about AoS currently. We'll see if the other changes are for the better or not. At least it might provide an opportunity to rope in some new players.