Not content with merely being bought by another wireless carrier, T-Mobile went and launched a new 4G smartphone and set pricing for two other 4G devices today at CTIA.

The LG G2x is basically a Tmo USA version of the Optimus 2x launched in January at CES. Powered by an NVIDIA Tegra 2 dual-core processor, G2x features a 4″ display, Android OS, and some pre-loaded games (plus NVIDIA’s Tegra Zone app) to show off that processing power. The device will be available “later this Spring.”

Also coming later this Spring is the Sidekick 4G, which gets official with pricing: $99.99 on an unlimited data plan or $149.99 with a cheaper data plan, both after rebate with a two-year contract.

Last but not least is the Android 3.0 powered LG G-Slate tablet, which will run $529.99 after rebate with a two-year contract. Pricey, no? In the words of T-Mobile PR:

The G-Slate delivers a premium mobile entertainment experience with a brilliant 8.9-inch, 3D-capable, multitouch HD display and the ability to record 3D and full HD video. With the new G-Slate, customers can access their favorite TV shows, magazines, games and more with pre-installed applications such as T-Mobile TV, Need for Speed SHIFT HD and Zinio eReader. The T-Mobile G-Slate will cost $529.99 after $100 mail-in-rebate card with a qualifying mobile broadband plan on two-year agreement, voice line and enrollment inEasyPay.

I got some hands-on time with LG’s Optimus Pad, essentially a G-Slate minus the T-Mobile branding, back at MWC in Barcelona last month. While I really dug the tablet’s form factor, I wasn’t really sold on the whole 3D thing. But don’t take my word for it – check out the hands-on video I shot in Spain:

All right, so who’s up for some renewed T-Mobile brand loyalty now that they’ve promised us some new toys before the whole AT&T deal goes down (or gets shot down by federal regulators)?