Source: http://www.labnol.org/internet/google-sites-replace-google-page-creator/4086/
Google Pages is still a part of Google Labs but this web page creator software will never get a chance to graduate from labs as it is getting replaced by Google Sites - a new product similar to Google Pages but with a wiki.
Google has stopped accepting new sign-ups for Google Page Creator though existing users can continue using the product like before.
However, all your files, images and web pages stored in Google Pages will get shifted to Google Sites later this year. This may be a concern for some as it will lead to broken links because Google Sites and Google Pages follow a different URL structure.
A big difference between Google Page Creator and Google Sites is that the former lets you upload HTML pages that are created externally - this is something you’ll really miss when the Google Pages to Google Sites transition is complete. Thanks Satish.
Google Sites to Replace Google Page Creator - Digital Inspiration by Amit Agarwal