Could be anything. Could be they needed more time to make their engine work properly on the Wii U, so that the rest of the porting process goes smoothly. That didn't work out well because of the nature of the game. Hence why they're saying they'd rather port it to the NX than downgrade everything so it works on the Wii U. 

You know far too well how Nintendo fans will react if the version they get is downgraded too much. I don't think I need to dig examples to show you how that happened time and again over the last few years. 

So I don't think they are lying at all. I think the reasons they gave are legitimate, espectially considering the nature of the game they developed. Which kept getting more and more ambitious over the course of development. The game has some problems running properly on the PS4, for Pete's sake. It shouldn't be more clear than that. The Wii U is struggling to run the game in the form they've made it / making it run on the Wii U in respectable manner is a struggle. I don't see a reason to think this is a lie.

Announcement != coming out. An announcement would give them time to optimise the current version as a 1080p60 launch game. Not so evil if you ask me.

Why arent you sick of Reggies lies? He promised all of you back at 2012 that the Wii U would have the support of the industry. 3 years later look at the entire panorama, it is just unacceptable from a consumer point of view.

If Slighty Mad Studios manages to complete the game on the Wii U but have to downgrade it hard from what we have seen from the PC, Ps4 or X1, would you buy it? Would you buy the game running at 640p/30? With less cars on the road? Would you?

Do i have to remind you what happened with Watch Dogs? The situation was the same, every version was released but the Wii U. Then months later the game was released slighty downgraded from the 8th gen version, but still better than the 7th gen versions, what happened? The game FLOPPED so horribly that Ubisoft stopped releasing games for the Wii U. It was the last chance for you people and nobody stood up for the developer. Every single Ubisoft game have flopped on the Wii U, minus ZombiU for obvious reasons.

Lets be real here people, Project Cars would have flopped on the Wii U.

Context much. half way through getting the game to run at 30fps, not halfway porting the whole damn game.

No NX announcement at E3, No mention of this year. See, studios would know before we do and it could happen behind the scenes. Christ.

Please read the OP! Here's the next sentence.

Our work might just be the best thing that ever hit that new console in the driving sim genre So we're playing a waiting game at the moment and yes, economics do come in to it."

He is refering to the game as a whole.

No, he means halfway through optimising the game for a solid 30fps, they might go and announce the next console making all the optimisation pointless when they'd be better putting that resource into moving it over to the Wii U's successor instead.

Just because it's in the same paragraph, doesn't mean it means the same thing. The context of "halfway" was clearly at optimising the game. The game itself is done, the code is on Wii U, it runs like ass. Optimisation is the next process. They're currently evaluating whether it's worth doing it as the potential early reveal of a new console would basically null all the effort they would have to put in.