Wow! Is it same forms and requirements as FLR(M)? Is there an in person appointment for ILR as there is for FLR(M)?
There is an in-person option for ILR - the same £500 premium service appointment (which will likely be more by then)... and of course, ILR costs more too. Currently, it's £1,875 but who knows how much more it will be in 2 years' time.
The ILR should have most of the same requirements - relationship, accommodation, financial requirement - but your wife will also need to pass the Life in the UK test before applying, and she cannot have any unspent criminal convictions.
However, as no one will qualify for ILR under the new 5-year rules until July 9 2017, they haven't released any new forms or guidance for it yet.
The current ILR form is for people applying under the old 2-year rules, and at the moment, we don't know if or how much it will change for the 5-year route. I'm hoping they release the new form soon.