http://www.gran-turismo.com/us/senna/
awesome!
that's at least a Lotus F1 car, possibly more Senna in-game content, and non-senna content...
statements like these are key:
"leading up to the release of more in-game racing content in the latter half of May"
"Introducing the "Ayrton Senna Tribute" in the May update"
Note that they say "in the May update", not "Ayrton Senna content arrives in May". Since this was certainly written for an English speaking audience, that verbage is significant. That signifies there is a possibility of more coming in May as well. It looks and feels as though we're in for a bigger surprise than we might be able to immediately see.
Also, note that the announcement says nothing about a Lotus car, but shows a sneak peek of the car. That means there is more than is being announced, and they are intentionally trying to build hype and intentionally trying not to make big promises. While that sounds sort of gloomy from one perspective, it signals they are starting to understand their (PD's) flaws and do something about it...
One step at a time just like the rest of us.