A number of current and potential Surface users have been requesting an LTE Surface. Last year, Microsoft officials said that the company's telemetry data showed that the majority of potential tablet purchasers didn't want or need LTE.
Microsoft is working on a Surface Mini with a screen size somewhere between 7 and 8 inches, and according to my sources, it will launch in the spring of 2014. The Surface Mini will be ARM-based from what I've heard from my contacts. (Qualcomm is the expected processor, rather than the NVIDIA chip that powers the ARM-based Surface 2.)
I'm wondering whether the Surface Mini is also going to be LTE-enabled or Wi-Fi only. No word on that (so far) from my sources.