I have some personal opinions on this.
After all the hype about 4/3 and the excellent lenses created, Olympus could not sell enough of the lenses to general mass. The bodies (less the sensor), are excellent in many areas. It worries people as major manufacturer would like to give something every year to their consumers, whether entry, mid level or high end users, to look forward to.
Here now, Olympus are selling more m4/3 bodies than before as users buy them to use with their Leica, Zeiss and other manual focus lenses. m4/3 lenses simply cannot make it, neither does the sensor in the Pens worked that well. Olympus, in my humble opinion, is basically selling bodies and some lenses (which are inferior to the 4/3 lenses, but delivers great performance/price/weight ratio).
History does repeat, when Olympus stopped their OM system. They are perhaps buying time to sell more m4/3 to fund the development of 4/3 bodies and lenses. They are also not intending to replace their excellent 4/3 lenses in less than 5 to 8 years. They might just come out with another range of fast zooms at F2.8 instead of F2.0 to decrease the weight.