Traveler - when you get into wider focal lengths, the need for a faster aperture is diminished somewhat. The general rule to achieve in-focus, sharp photos is to use shutter speeds of 1/focal length (so a 50mm lens should be shot at 1/50th of a second - with the m4/3 format you would double it to 1/100th due to the crop factor as well). Image stabilization helps to achieve even slower shutter speeds (but is not available on the 7-14mm, unless you use it on an olympus m4/3 body).
So with a longer focal length, a faster shutter speed is needed to achieve a sharp image, but this also contributes to the amount of light coming into the lens. If you were using the 45-200mm at 200mm, you need to shoot 1/400th to get a sharp image - there is no way you could shoot at 1/400th indoors though, the image will be dark. With the 7-14mm, however, you only need shutter speeds of 1/15th-1/30th to achieve sharp images - these shutter speeds are also typical for a reasonably lit indoor scene.
The rule of course also depends on how well an individual can hand hold their camera - some do a better job than others, and that is something you will learn with your own practise. Finally, at slower shutter speeds there is never a substitute for a solid tripod!
So, having a constant f4 lens is nicer than the 4-5.6 that will be on the 9-18mm (constant aperture lenses also help with you are using flashes, especially off-camera flash which require additional setup). With that said, the fast speed is not AS important as it would be on say if there were an option to purchase the 45-200mm as the current f4-5.6 vs a (hypothetical) 45-200mm f2.8 constant aperture lens.
7-14mm is also smack in the ultra-wide category. It is equivalent to a 14-28mm lens in 35mm terms, while the 9-18mm is an 18-36mm equivalent. I have owned both a 10-20mm and 12-24mm lens on my pentax dslrs (which equal 15-30mm and 18-36mm in 35mm terms). I can tell you the 9-18mm would be a more practical focal length if you intend to get the occasional portrait, and would be more suited to use as a walk-around lens. The 7-14mm is definitely more of a specialty lens, designed to get up close while getting absolutely everything in the frame. The 14mm pancake that is forthcoming is an entirely different category as well - alot of pentax shooters like to carry pancakes only, and if you enjoy the 20mm alot it is definitely another option, but 14mm (28mm equivalent focal length) is not extremely wide, especially compared to the 7-14 and 9-18 lenses.
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