The midland mainline electrification project is missing out Leicester as well. Will stop at Wigston and restart again north from Syston with the Leicester section done at a later date. Whole section is a bottleneck through Leicester and needs a new layout, plus they can't fit wires under the London Road bridge into the station easily.
Any link from the Burton line to Leicester that doesn't need a reversing move will be massively expensive, plus can't see them wanting a terminating service near the KP. You might as well just invest in the bus routes into Leicester, have express services to compliment the ones that stop at every village (bit like the Skylink service between Derby / EMA and Leicester). I guess this is why they're talking about running a train service to Derby before Leicester.