Yep. For this time though, some carriers are about 1.5 months earlier with tidbits of information. Seems this launch is about a month earlier (at least) than the S3. Perhaps Samsung thought Apple would release a bigger display phone this summer, so wanted to take more marketshare ahead of time. Makes sense.
Indications now though are the new iPhone will still be 4" and next year will be the bigger option. That said, just a few months ago the big rumor was a bigger iPhone.