You may also want to hold on for just one more day...rumors point to a Sony announcement tomorrow of another eMount telephoto option - the SEL55-210mm OSS. This lens won't have the wide end reach of the 18-55, but will also be lighter and significantly cheaper. It appears to be about an inch longer than the 18-200mm overall, but also about 1 inch less in width, and is rumored to be around $250 US.
Personally, I'm waiting to hear more about this lens, and may choose it over the 18-200 if the optical quality is good, since it is so much cheaper and should be quite light.
Sony DSLR-A580 / Sony 18-250mm / Minolta 50mm F1.7 / Sigma 30mm F1.4 / Tamron 10-24mm / Tamron 150-600mm / Tamron 90mm F2.8 macro / Minolta 300mm F4 APO
Sony A6000 / 18-55mm F3.5-5.6 / 55-210mm F4-6.3 / 10-18mm F4 / 35mm F1.8 / 16mm F2.8 / via manual adapter, lots of Pentax K mount, Konica K/AR mount, and Leica M mount manual lenses