Notice that the article says that Sony owns Studio Liverpool/Psygnosis so it is an internal development at this point, Dev kits might be available to a select number of devs with access to media grabbing IPs though to get a good starting line up ready. Also you can almost guarantee that as soon as PS3 hit the shelves that preliminary preparations for a PS4 would have been well under way, also with all current Gen consoles are looking their age now and both Nintendo and MS having their own next gens entering final stages of development (am I right in thinking next 2 years?) that the PS4 will be in a similar state.
in response to the OP I hope the Wipeout IP isn't lost to the legal abyss, for me Splinter Cell has lost it's magic but mental paced 0g racing still has some play time for me.