Without knowing your specific personality and needs, it's difficult to advise you on this topic. However, based on comments you've made, the following seems to be the case:
1. You don't have an immediate need for a tablet, since you already have the functional BB Playbook.
2. You intend to play games on your tablet.
3. You have some concern regarding "future-proofing" your tablet, in terms of OS upgrades.
4. You desire more built in storage than the current model offers.
5. You very recently purchased the Nexus 7, though it's not known if you've taken it out of its package.
Based on this information, the scale tilts toward returning your N7, assuming you can get a full refund, and waiting for the updated version this summer. Why?
1. Your basic tablet needs are currently being met and three months will whizz by in a flash.
2. The next gen N7 will almost certainly be enhanced in terms of overall performance, so games should work just as well, and maybe better, even without the Nvidia Tegra chip. I don't know enough about the technology to comment on Tegra optimized games, but my guess is they would work satisfactorily.
3. Waiting for the next gen N7 means that the hardware will be "relevant" for a full year longer than the current N7. Maybe this also means OS upgrades will be available for a longer period. (Of course, after two years you'll likely be ready for a new tablet anyway, so the OS upgrade capability should be relatively low on your needs list. Also, not being able to upgrade doesn't make your device less useful.)
4. The next N7 might (or might not) include other enhancements beyond display and performance, such as a rear camera, Miracast, better WiFi, increased storage (a preference of yours), HDMI out, etc, so three months to find out seems like a worthwhile trade off.
With all that said, there is no guarantee that the next N7 will have the same impact in terms of features-performance vs. value that the original had. It's also possible you'd prefer the materials used and the shape of the original version, assuming there is a significant change. But these are minor issues compared to the likely enhancements.
The last thing to keep in mind is that other tablets might meet your needs better, in comparison to the next gen N7, by the time summer rolls around. I would at least go to your local store to look at other available tablets, just to make sure the new N7 has everything you want. Others may not provide a pure Android experience, but that doesn't mean that they are not worthy competitors, even if priced slightly higher.
By the way, a final option, especially if you discover that you can't get a full refund for your current N7, is to use it for the next few months, then sell it for perhaps $125 as a lightly used item, putting that money toward the purchase of the new model. In this way, you get three or four months of fun now, plus the advantages of the latest and greatest later. That is, of course, until the next latest and greatest comes out.
Good luck!