Credit to @Yzeguy for noticing this. The $50/40GB plan is now 5G instead of 4G that it was until now. You have to change into the new version of the plan to get the higher speed (as far as I can see). My scheduled renewal to the 4G version hadn't even happened yet, but I was able to change it to renew into the 5G version. And to backup my theory that you do have to make the change from the 4G version (if you have it), the new version of the plan was available for me to renew into, even though I was already scheduled to renew into the 4G version; normally you don't see the same plan you're trying to renew into as an option if you already have it scheduled.
Looks like a couple other plan changes too. The $44/30GB 4G plan is gone, but for $1 more you get the same but with 5G speed.
And a second US option
