The Lenovo A5500 (the only of the two that’s being pictured) seemingly features an 8-inch IPS display with 800 x 1280 pixels, a quad-core 1.3GHz MediaTek processor, Dolby Mobile sound, and an 8MP rear camera. A recent GFXbench listing confirms the 1.3GHz processor, the 800 x 1280 pixels display, and Android 4.2.2 Jelly Bean.
The Lenovo A7600 appears to have the same screen size as the A5500. The higher model number could mean that it has a higher pixel resolution - but we can’t be sure of this for now. In any case, this is also an Android tablet.
While the A7600 and A5500 models approved by the FCC are Wi-Fi-only, the ones certified in China have cellular connectivity (3G), and can make voice calls.
We don’t know when the two Lenovo tablets will be announced, but we assume it will happen in the near future. Both could be part of Lenovo’s IdeaTab series, which includes affordable tablets like the IdeaPad A1000 and IdeaPad A3000.
sources: FCC (1), (2), GFXBench, Teena (1), (2)