From Wikipedia: "Since 1999 Larson has objected to his work being displayed on the internet, and has been sending takedown notices to owners of fan websites and users posting his cartoons. In a personal letter included with the requests, Larson claimed that his work is too personal and important to him to have others 'take control of it'. Larson has been criticized for not providing a legitimate online source for the Far Side series and negatively compared to cartoonists who have embraced the internet."
This could just be Larson finally deciding to publish the old strips online.
"No images or other content displayed on this Website may be reproduced, digitalized, stored in a retrieval system, made available via any computer or wireless networks, transmitted or in any form or by any means, or otherwise circulated in any form, without prior written permission of FarWorks, Inc." This seems hard to achieve, though …
This could just be Larson finally deciding to publish the old strips online.