Well, the first PS games to release the PlayStation the Best versions were the iM@S SP games on PSP. The games originally released on February 19th, 2009 and the Best versions released on January 28th, 2010, less than a year later.
The other release to do that was iM@S 2 on PS3. The game originally released on October 27th, 2011 and the Best version released on August 2nd, 2012, barely nine months later.
For comparison, I'll also list the Xbox 360 titles.
iM@S 1 - Original: January 25th, 2007; Platinum Hits: November 1st, 2007 (nine months)
iM@S Live For You - Original: February 28th, 2008; Platinum Hits: March 12th, 2009 (just over a year)
iM@S 2 - Original: February 24th, 2011; Platinum Hits: August 2nd, 2012
Basically, every iM@S game gets a "high seller budget release" of sorts no more than a year later (with the exception of iM@S2 on 360, which probably had its sales slowed significantly by the updated PS3 release). I'd say expect these around August to September next year.
Actually, come to think of it, I guess the DS game never did get any kind of budget release, but Nintendo doesn't usually do those in the first place, and even if they do it's only for first party games.