Priority pinging is going to be a premium feature only.
Ping Plus is bought through your Eco Points. We are still working out all the info for Ping Plus.
Ping Plus will ping your websites every thirty minutes. Now I know that we said in the last page that we have to stick to 1 hour pinging due to the 429 Too Many Requests Error code. Yes we need to stay below that limit. 30 minutes is still below that limit. With Ping Plus we log a bit more then what we log with normal pinging. We log: the link that was just pinged, the time it was pinged, and the status of the site. We will in the future be adding a way to log how long it took to ping.
Ping Plus also gets you more link storage.