With our recent release of Snort 126.96.36.199, as I stated in a previous blog post, this marks the beginning of the "end of life" for Snort 188.8.131.52.
We've updated the Snort EOL page today which marks the EOL for 184.108.40.206 (2017-03-14).
If you are interested on our "LTS" or Long Term Support version of Snort (220.127.116.11), I suggest you plan your migrations now.
18.104.22.168 will be supported until the next major release of Snort after 22.214.171.124.
If you want the newest features of the ruleset and Snort, we suggest you upgrade to 126.96.36.199, which is our current release. For more on the features of Snort 188.8.131.52, please read out blog post.
Please remember, as per my previous blog post, 184.108.40.206's ruleset will not be backwards compatible to Snort 220.127.116.11 once the newer keywords are used.