I had a similar experience last night with 5v5 arena. Queue popped, I clicked the enter button and nothing happened. I right clicked on the minimap icon, selected enter instance but still wasn't teleported to the arena. After a minute I checked my arena tally and noticed I had been credited a loss and lost 23 points

I haven't really noticed a difference with queues at all on Bloodlust. My understanding with changes were that multiple battlegroups were organised into regions from which matchmaking could occur. In 5s at least I have not faced a non Bloodlust team in 23 matches playe this week so I am not sure if this has bene implemented yet?