Yahoo News reports that after getting little more than a fleeting glimpse at the LG-built G-Slate at CES last month, T-Mobile has finally spilled the beans about its upcoming Honeycomb-based Android tablet, including the news that the device will boast a 3D display—well, “3D-capable,” anyway. Expect the G-Slate to arrive this spring, T-Mobile said, complete with a dual-core Nvidia Tegra 2 processor, support for T-Mobile’s 4G HSPA+ network, and Honeycomb—the latest, tablet-centric version of Android—under the hood. Still no word on pricing. As for the G-Slate’s display: it’ll be 8.9 inches, a little smaller than those on the current iPad and the upcoming Motorola Xoom, but bigger than the seven-inch screens on the Samsung Galaxy Tab and the new Dell Streak 7. T-Mobile didn’t reveal the exact resolution of the G-Slate’s screen, although the carrier promised that it’ll handle both 720p video playback and 3D…