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Quite true, but more coming. There are only 4 weather sealed m4/3 lenses, but they cover a good range: Oly 12-50 kit, Oly 60 Macro, Panny 12-35/2.8 and Panny 35-100/2.8. The Pannys are expensive, the Olympus not as much.
Thing is, most systems only have expensive weather sealed lenses, so it's not unusual.
A few points to keep in mind.
Although several camera manufacturers advertise their body/lens as being "weather sealed", they don't warrant against water damage.
Seals dry (or fail in other ways), and must be replaced. My diver watch is sent in every 3 years for seal inspection/replacement.
There are numerous products on the market that enable any camera to be truly "water resistant". I'm partial to the Kata rain covers, but there's plenty of good options.