In v1, it was possible to fetch up to 100 of my tweets that have been retweeted with a single request to GET statuses/retweets_of_me.
If I’m not mistaken, the only way to do the same thing in v1.1 is to call GET statuses/user_timeline. However, there is no guarantee that calling it once will return 100 retweeted statuses (since this resource returns all my tweets, not just the retweets ones). In the worst-case scenario, I’d have to call this API 16 times to retrieve 3,200 tweets before finding the first 100 retweets.
What could be achieved in a single request now could require as many as 16, which is more than is allowed in a single 15 minute window.
I’d strongly encourage you to rethink the rate limits on GET statuses/user_timeline, GET statuses/home_timeline, GET statuses/mentions_timeline, and GET statuses/retweets/:id, since these resources are being used to replace multiple resources that existed in v1 of the API.
Also, am I correct in stating that there’s no v1.1 API replacing GET statuses/retweeted_to_user? I’m surprised there was no mention of this in the announcement of v1.1. Removing existing functionality seems like worthy of inclusion in the overview of the changes.