LG's next big thing, the "X3", will be unveiled at Mobile World Congress next week as the LG Optimus 4X HD, according to reports from PocketNow. If true, the branding would give weight to what's already been rumored -- that LG's next flagship phone will sport a quad-core Tegra 3 CPU and a 720p dispay. Based on recently leaked-benchmarks, LG's looks set to deliver a beast of a phone, with early scores dwarfing current high-end handsets (and we'd expect no less from Tegra 3).
The site also reports references to a T-Mobile G4X, possibly based on this design. It'd makes sense that the 4X HD might become Tmo's latest G-series handset, as we've seen screenshots of near-vanilla Android running on one version of the device very recently. Whatever the phone(s) end up being called, we're sure to see them in a few days at Mobile World Congress.