For those of you who haven't heard, the new League "Domain Keep" is 500g but you get to keep the cards you're given at the end of the league, which makes for a substantial discount on the regular pack price (100g each vs 150g each).

great way to get into things.

Well actually it is a Domain league so you get 3 packs in the domain of your choice. So it is actually the same price as buying packs but you have a chance of winning enough gold where the packs are all free. We also added 300g to the prize pool.
So it is certainly a better deal than just straight pack buying.
And also the packs are all from the same domain so if you are working on a particular race you can be sure and get more cards that will help you.