Neowin picked up rumors that Microsoft is testing new Surface RT tablets with the Qualcomm Snapdragon 800 chipset. This new model is expected to arrive towards the end of the year.
Bloomberg claims that Microsoft will update the tablet with new chips from Qualcomm, while NVIDIA will "continue as a supplier for some versions", presumably including the existing model with its Tegra 3 chipset.
Meanwhile, The Verge is citing separate "sources familiar to Microsoft's Surface plans", stating that a Windows RT 8.1 Surface device is already in testing at Microsoft, powered by a Qualcomm Snapdragon 800 chipset. The report accurately states that the ARM-based chip has integrated LTE radios, but it's unclear at this stage whether a future Surface will come with mobile broadband capabilities.