The test client takes up about 5.5GB on my disk (if you download it, make sure to empty the Updates folder afterward, as that was another 5.5GB). 0.4.1 will come to standard WoWS after a little while; WG's public tests are for testing balance changes in larger populations as well as (hopefully) weeding out any bugs that might've slipped through the supertest.
If World of Tanks is anything to go by, I'd expect a few iterations of the public test before the patch goes live- at this length maybe a couple weeks. But as Tanks public server iterations usually last a week or two and this one lasts a few days, you should take this estimate with a pound of salt.
thank you for your help!