Hey I work for MSN Dial Up Support, now I know 250mb will not be launched until Fall. There isnt a specific date set yet. Hotmail Extra Storage customers (2GB upgrade) are in process of upgrade and currently there 75% complete for them. As for Free accts well have to wait until Fall. Current Subscribers will also be upgraded to 2GB with 20 mb attachments around the same time. Honestly though I have had alot of customers calling because suddenly they cannot send mail, so right now I think its a work in progress and hopefully in the end it will be worth it
Side note:
http://www.imagine-msn.com/hotmail/en-us/
is not an official MSN link. If you notice, when you highlight the 19.99 a year link... it shows another completely different URL with a "where from redirect link" its a gimmick ppl use to make money by traffic. Its legit in the sense it doesnt mean any harm but it is not an official Microsoft MSN Site
Edit: merged triple posts.