On the eve of RIM’s highly anticipated announcement for its new BlackBerry 10 devices, we’re getting a look at its latest smartphone for T-Mobile – the OS 7.1 running BlackBerry Curve 9315. Essentially a variant of the Curve 9310, it’s priced to sell for $49.99 on-contract, but the question that remains is whether you’ll want to pick one up knowing what’s on the horizon...