Glorious news this morning. Enabled it on my Nexus 4 with Telus and I can confirm that this works absolutely fine.<p>However, I'm quite curious about the battery life impact. So far the N4 isn't a champion in this category. Adding LTE..
I adjusted the settings on my Nexus 4 (T-Mobile in the SF Bay Area). I saw a marginal increase in my bandwidth (going from preferred WCDMA to LTE/GSM/CDMA/(PRE) in the menu entries. It is no way a scientific test but the results are a consistent 2 MBps increase which is not enough to claim that LTE works but is a nice to have. I will do more research and post it here.
I was a bit confused as to why this was remarkable. I found out that the Nexus 4 isn't billed as supporting LTE, so this unofficial support is essentially "for free".