Where routing is concerned at L3 they've traditionally followed Routes 1 - 3 we will all be too familiar with by now. Confusion comes from Route 4 which as I understand it at Oxford is simply their marketing for their Integrated ATPL whereas the L3 Route 4 was an entirely different scheme launched in the latter portion of last year to fill the sudden additional demand from easyJet. L3 took non-type rated, non-L3 cadets onboard to complete the AQC and Type Rating. If you fail to secure Routes 1, 2 or 3 at L3 then you may well still stand a chance of the typical Integrated scheme and that's no different to any airline program at L3 but on the face of it Whitetail and Route 3 are much of a likeness.
Route upgrade wise I've not heard anything personally but the majority of the new easyJet Route 2 / 3 cohorts are coming to the end of their ground school in the coming weeks. Perhaps things will come to light then.