PlayStation Community moderator, RabidWalker has just confirmed some new details regarding the PlayStation Networks welcome back pack.

He has confirmed that due to the PlayStation Store taking a little bit longer than expected to return Sony are adding an extra 10 days onto PlayStation Plus subscriptions.

It has just been confirmed that, due to the Store coming
back a little later than we hoped, the extra days added to Plus
memberships is being extended by another 10 days so you are getting a
total of 70 days extra for free. This will show up automatically on your
account in the next few days.

- If you were aPlus
member on or before the 21st April, we have automatically added a full
60 days onto your Plus membership to make sure you get back any time
missed. You dont need to do anything to get this; it has been added to
your account and your membership will simply carry on for 60 days past
the original renewal date.

- We will be keeping Aprils content on the Plus section of the Store
for a further 2 weeks in case you missed anything before the 21st.

- We have an action packed month for you in June and, for the first
time, we have a fantastic EA title for you our flagship title this
month is the amazing open-world racing game and the king of arcade
racing. Burnout Paradise is available to download as part of Junes
content list so dont miss it.

Source: Playstation Forum