I can see both sides of it:
On the one hand I'm sure atmospherics is a
massive undertaking. I'd rather they took longer over it and got it right.
£40 isn't a lot for a game you enjoy if you view it in terms of a subscription model. I personally would hate a sub-based system and it is 'exciting' being part of a living, continually developing game. Cobra Mk. IV only for those who bought the game in the first year is IMO at least some way of mitigating against the 'cheap for new customers, expensive for current' thing. So, £40 isn't at all bad compared to a sub and you don't have to pay it to keep playing your current game as you would with a sub (though to be fair the game was never billed as a subscription title and it's not as though FD could legitimately pull the plug in that regard and start demanding a sub...).
On the other hand...
£40 is a full price game. Full price game. Let's not forget that. An entire game is sold for this amount and you can expect the same for next year's season and so forth. Fallout 4 and the Witcher 3 are in a similar price bracket and have both seen many years of development. IMO Wings, Power Play and CQC do not equate the value of a full title. If you view Horizons purely as an 'expansion,' it's expensive.
Not only that, but it's not even ready/finished as a normal 'expansion' or 'full title' would be; your £40 only entitles you to (probably) a bare bones launch around December with the rest of the year for them to work on the content, whilst you pay full price up front.
FD want you to go in blind: Not prepared to talk about anything beyond planetary landings, yet very keen to stress that landings are only one part of what you're buying.
Limited time discount (why?) and high relative price for existing customers, with very little confirmation on what content you're paying for. Feels a bit like crowd funding again; paying for a beta product of which you know very little about (but at full price).
To continue beta access (from Standard Beta) will cost another £10. This is a bit cheeky IMO; should have either been free or half price for existing beta customers. Especially considering that this helps FD as well as being fun for us. Sure, £10 isn't a lot seen on it's own, but it bumps that price up to £50, which combined with the 'limited time only' discount and 'don't know what you're buying' deal comes over as bit money-grubbing IMO.
Just my opinion though

. I'll be watching this space for more info before placing a pre-order.