Web Gateway 6 will be supported until the end of 2013.
Whenever you see a notice about 7.x or 6.x, "earlier" refers to earlier versions of that specific version.
So in truth 7.0.x and earlier means 220.127.116.11-7.0.2.x.
Jon is correct. The reference to the version is in regards to the main version that is referenced.
We honot published EOL dates. In case of an overall change this change will be published in addition.
The announcement is simply to make sure that customer, who are still on the EOL'ed 7.0 version are notified about the stop of updates and can react appropriately. We generally continue shipping updates for EOL'ed version for 6 month beyond the EOL date as courtesy - thus the announcement.