To start with I'd really like to be able to use PHP 7 before something like 3.5 to 4 years from now and I don't believe that I will be compiling it myself, but who knows. I'm trying to build a strategy for moving over to this and its up to first of all when PHP 7 is itself released and then catching either Debian or Ubuntu packaging it. Debian 9 looks like the overly optimistic choice and Ubuntu 18.04 will probably have it and maybe sooner by 17.04 or so (although not LTS). I'm thinking that in an ideal world I would put my sights on a specific Linux distribution and then hope that Phalcon could support PHP 7 within six months of that Linux distribution being out while I continued to wait back on my deployed version.
I don't think that its terribly important for Phalcon to support PHP 7 from day 1 from an engineering perspective as its acceptable for there to be a window of months while a new ecosystem consolidates around a new breaking version. If this happens within 6 months then I will consider PHP 7 to be wildly successful in comparison to say Python 3.
I think though that from an image standpoint that the blogosphere of Phalcon nay-sayers might have a field day with Phalcon not supporting PHP 7 and so its probably best that there should be an earlier effort to at least be looking like support is arriving shortly. Too many people will be saying that Phalcon is a dead end and this could discourage many new users.