You have a great bike. The new 27.5 version would still only be marginally better if all the marketing bumf behind the wheel revolution turns out to be true.
Internet forums, mtb magazines and marketing do generate a lot of bike envy to the point of turning you against your own trusty steed and believing your once beautiful bike is really a heep of crap that is holding you back whilst making you the laughing stock of the trails.
And by buying the latest bike you will reach mtb nirvana and thus being eternally happy.
Thing is, there will always be a new bike, much better than any that have came before,
Meaning you will never be happy.
All of the above is easily cured.
Stop looking, and ride your bike instead.