Humongous fan of this series. Currently playing and will indeed platinum it on my first playthrough of it to get the secret ending. There was also a leaked picture of a Sly 5: Master of Thieves logo. If the 5th game is as good as Thieves in Time, then I'm looking forward to it like nothing I've ever looked forward to before.
I swear, Thieves in Time is so good, I consider it my favorite Sly Cooper game. Tons of collectibles, the characters are actually much more character in them. Their facial and body movements have been improved. Of course, they've had years to polish on everything and they did. The level design, the updated art style... All phenomenal.
Can't go wrong with the jazzy swing soundtrack, either.