The transfer part of the HTML5 transition period has concluded, but unfortunately, it brings some news which may be a little disappointing to some people; your igloo music will not be transferred over. In other words, you won’t have the same tune playing in your igloo on the HTML5 client, which I understand might be frustrating if you’ve kept it for a while.
No [igloo] music saved, sorry – everything else did.-Gravix, Club Penguin Rewritten developer
The good news is that everything else saved! That means you won’t need to re-decorate your igloo on the HTML5 version, but you will lose the igloo music.
I still have no further information on when the HTML5 client will be released, but it should hopefully be soon! I’ll be sure to keep you updated about any development – big or small – though.