The olympus 45mm lens, if you can afford it, will take magnificent close up to medium distance shots. It's the perfect portrait lens, giving fantastic bokei. The 14mm or 20mm panasonic will give you great panoramic views and will also take interesting close ups. From a medium distance they can take a shot of a deer, for example, and the surrounding landscape. From a longer distance though, the deer will seem too far in the distance. If you're just planning on zooming into wildlife from a fair distance away, the 70 - 300 will probably work just fine on it's own.
Although 150mm effective is a little short for many wildlife shots, when you can get closer the Olympus 75mm is one of the sharpest lenses you can get. It's also expensive compared to many m43 options but you will never doubt it's performance.
Consider Olympus 45 mm. For the money it's really sharp and light. I use it with Panasonic 20 mm, 1.7 lens for my travel and backpacking adventures and I'm always amazed at quality of this set up at such a low weight. If you like check this photo blog, shot exclusively with this set up. http://www.marktrela.com/2013/07/16/north-manitou-island-trip/
Agreed on the Olympus 75mm f/1.8. Depending on the setting and subject, it may not be long enough, but it's tack sharp. I own a lot of lenses and this is far and away the more impressive. Don't be afraid to buy 'old' film SLR lenses. I've bought a couple 50 year old Russian lenses and if you don't mind manual focus you can't beat the bang for the buck.