I do not remember the exact url or name of the topic. My memory is not that good. Sorry. Try using the search enigine on the indicated forum.
You're the one claiming vBS giving an ETA for PHP 5.4 compliance, so it really is up to you to back that up. If you can't, I'll just assume it never happened: You don't remember because there never was an ETA given - not for vB 4.2.2 and not for any other release in the past. Not even the announcements Zachery linked to, dating today, conain an ETA. Anyway, an ETA hidden away in some obscure thread no one ever saw or can find, given by some poor support wretch that might be fired the next day would mean nothing anyway.
There is no 4.2.3 yet. Only 4.2.2 PL1 at support area.
Look again.
4.2.3 Beta 2 is available. Its perfectly fine to run on live sites, and for php 5.4 & 5.5 would be the better choice than 4.2.2. It *should* (afaik) be ok for php 5.6 as well.