Yes, buy a Nexus 7. It's fun, useful and practical.
Sure, wait a couple weeks, but it's possible in a couple weeks the newest rumor will be that there will be an announcement in another few weeks. Then wait another few weeks for the next rumor of another announcement.
But whenever you buy it, I'd highly recommend you spend the extra money and get the 16gb model (or 32gb if it exists when you buy it). You may or may not need it, but you definitely can't add it on later. It will give you flexibility and breathing room, and you'll have less concern over the number and size of apps downloaded, or storing some media files locally. Yes, you can use an OTG cable and flash drive for extra media storage, but it's not the most convenient thing to do.
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