You can see them on battlelog
http://battlelog.battlefield.com/bf4/
It doesn't, it comes out every other year, just like the modern warfare / ghosts series does.
In between is Treyarch's offering, but EA are reportedly looking for another developer to produce a "spin off" title that will be released an alternating years, again every other year to match them.
They previously had the medal of honor series in this slot, but last year's game warfighter got absolutely slated so they binned it.
But even then, the other offering has to be released in October to beat COD. And they've just copied Activisions strategy of having two developers, produce a game every other year, but on alternating cycles meaning you get a new game in the same slot every year. Previously these games weren't linked, one was medal of honour, one was Battlefield, but latest reports suggest the new game in this slot will be a new "battlefiend spin off" title. So not battlefield 5, but some new title with Battlefield in its name somewhere to tie the two together, just COD does with Modern Warfare and Black Ops