Honestly, I shrug about this type of thing. People in all RPGs fret about the new edition like their previous stuff is going to suddenly be obsolete and worthless. But even if they print a new edition, does that mean that we will stop playing? Probably not. Chances are, if we stop playing the game, we're either getting tired of playing anyway and just looking for a good excuse to stop playing or we tell ourselves that things are too unbalanced and refuse to play the old edition in anticipation of "something better." Typically some tell themselves what they have is comparable to trash (after they hear news of *NEW AND SHINY*), and they can no longer "stand" to tolerate such garbage they own.
Many people continued to play 2.0 D&D long after 3.0 came out. Many still played 3.5/pathfinder after 4.0 came out or played 4.0 D&D and disliked it so much they were willing to return to 3.5/pathfinder. I mean not to degrade this into an edition wars argument of D&D, but to point out that some preferred older material.
Look, are games fun? Yes, that's why we play them. Fundamentally, most editions of the individual RPG game are extremely similar. Most of the time the dice, monsters, idea, etc are identical from edition to edition; game designers just try to enhance the "fun" experience from the last edition when they create a new one. D&D still rolls a D20 after all this time. Shadowrun still rolls D6's for tests against an opposed test or a target number. These ideals aren't likely to change.
As with all RPGs, the game is only as good as the people you are gaming with. And the game runs well if the people involved are willing to participate and continue striving to create a great experience. The game system can mess this up if it sucks and is bulky, but SR doesn't suck. There might be a few rules that are a little haywire and complex; but for the most part, it is fine. If they do produce a SR5, will we still buy the books? I know I will; and its not like they'll be pushing 5 core books in one month....they'll stagger them along like they do now. I read this stuff probably more than I play it. And a new edition won't change that.
But to answer your question, is it in the works? Like soon? I highly doubt it. Otherwise Hero Labs wouldn't be working on getting all the core books there on their sheet as they recently uploaded 3 book options; Catalyst also just reprinted several core supplements. It's bad business to reprint something pricey, then announce a new edition so all those reprinted books sit there and collect dust. Not saying it won't happen, but it is very unlikely.