I'd venture to say that rents are at their peak for the foreseeable future. Prices will be coming down significantly as speculators/investors are no longer able to sell their properties and are forced to rent them out. The amount of units coming on to the market at the same time the economy is in a recession/depression will keep rental prices down for many years into the future.
The rent prices at present are unrealistic and unsustainable. Along with a 50% decline in property values one would expect a significant decline in rental prices.
There is a lot of construction out in Dubai Investment Park. That along with Discovery Gardens, Jebil Ali Downtown, Sports City, Jumeirah Village, Motor City, and even Jumeirah Lakes Towers and the Marina would be the places you'll want to look to be closer to the new Intl. Airport.
Typhoonpilot