I do not see this as an improvement on what was promised at the D23 Expo. Especially the overwhelmingly derivative circus-land.
While I will agree with you that I'm not a huge fan of all this circus stuff (and I think that is a fairly consensus statement, it we are honest with ourselves), it is still a vast improvement over the D23 announcement as long a SWSA turned M&G eventually turns back into another ride.
Look at the leaked blueprints. The only thing PH had to offer according the prints are a M&G and a play area. That was it. That is now replaced with food and merchandise. Not an improvement, but perhaps something that is more needed. Barnstormer needed a retheming and dueling dumbos was always slated to be circus themed, so essentially I see FLE East as wash. Not the best theme, but neither was the original.
Now, lets look at FLE West, which I think is a tremendous improvement. Cindy/Aurora M&G was weak. Though the Cindy one I thought could be cool, to waste such a large amount of land on it was my biggest issue. Look at the leaked blueprint on how much space the actual attraction takes up and how much space the Chateau was taking up -- what a waste. FLE West needed another ride. Now it is getting it. Of course, we are also losing a ride, so as long as SWSA is ultimately replaced with another ride once the temporary M&G find a permanent home, I will be very happy with these changes.
Also, while I personally love thirll rides, I hope the mine coaster is not too thrilling. Fantasyland, above all other lands, should be rides kids and adults can do together. I think the mine "coaster" concept is awesome. But I want the thrill aspect to come through good theming, and good music. To wit, copying Grizzly Hall, which does look like a very cool ride, would not be a good fit, IMO. I have high hopes for the mine "coaster," and I will withhold my criticisms of it, until we have more information to be able to criticize.