Yes. We have protected blocks of rooms specifically for speakers, but even these protected rooms will sell out very, very quickly.
The SXSW Housing Desk works very hard to secure Austin-area hotel rooms for all speakers, if you have made a request via the SXSW Housing Desk they will email you when they have found a room for you.
Speakers sometimes drop out of the event, and as a result, some rooms open up as we get closer to the event. However, this is not guaranteed and it is still advised to book your lodging well in advance of the festival.