Regarding the XBox One Legacy Adapter, I am in the USA with Amazon Prime and got Amazon (via online chat) to move my delivery date up from 10/8 (next Thursday) to release day delivery on 10/6 (Tuesday) for free so that's cool. Hope that helps someone else.
Got the game digitally pre-loaded and all ready to go on my XBone but I have yet to go through and download the new versions of my DLC on my XBone yet. Not looking forward to that. I think I will wait until the game unlocks so I can use the in-game store as it seems to be a much better experience. Sad to hear about all of the features that appear to be omitted/missing/changed in RB4 but oh well. I will hope for them in the updates.
Also, I still need to go through and buy the remaining pre-RB3 DLC on my XBox 360 because I can't do it online (stupid MS not letting you use money in MS account on their website for XBox 360 transactions). Based on Harmonix's latest post I have to do that by Tuesday at the latest. I will probably try and knock it out Monday night.
I'm in the XBox Preview Program thing and I saw Major Nelson's post about getting more people into the New XBox Experience dashboard and it's discouraging to see people saying they are having issues with stuff working. Like others, I probably should have opted out this particular update(s) with this coming out, Battlefront beta soon, Halo 5, etc.