Everything Intel sells today clobbers any currently-marketed ARM chip on per-unit-energy computation performed. The race is not even close. ARM is only of interest if you are constrained by something other than compute (phones) or you don't know how to program and you are wasting most of the performance of your Xeons. The latter category contains nearly the entire enterprise software market and most other programmers as well.
Or, your program is entirely constrained by IO so most of the power of Xeon is wasted, while you still have to pay the premium for it.
This chip is interesting not because of the cpu core in it, but because it has two presumably fast 10GbE interfaces and possibility for a large amount of ram in a cheap-ish chip.
