Trees. Are we going to be able to carve them out as a miner would carve out stone, or would we still be limited to felling them?
Also, what's remaining on the to-do list for this release so far?
It would be quite awesome if we could that to the larger than 3x3 tile trees at least. It wouldn't necessarily hurt the tree either. The xylem or wood in the middle of a tree mostly just provides extra support, which the tree can manage just fine without.
This would actually provide for a very neat and easy solution for the elves to move up and down from whatever treehouses they may have up in the canopies now that I think about it. They could simply either have the tree grow an up/down staircase with openings where necessary (possibly even magical opening and closing of bark to cover the entrance) or even partly carve them out themselves as it's all dead wood which should make it ok to them.
Yes, but you have to realize the General Grant, the Grizzled Giant, and other such trees are very exceptional trees. While there are trees that get that wide, they are by no means common. Trees out in plains don't tend to get super wide at the base, they tend to develop very wide-spreading boughs, like acacia trees do. That, or they become shrubs. Trees and other plants generally develop extraordinarily broad trunks if they live in an arid environment, so they can store water better, or if they're really tall, to support the weight. 1x1 seems sufficient for the trunk of most trees, 3x3 is simply immense.
Actually, at least as far as northern european trees goes (which is what I'm most familiar), growing alone in an open plain promotes growing really wide since there's no shortage of space and it better supports the wide-spreading boughs you mentioned. Oak trees are the prime example of this, but I've personally seen both spruce, linden, pine and even birch grow far wider out in the open than they normally do in a forest (the birch in question was almost a meter wide!). It's actually quite logical, when there's no competition for sunlight there's no reason to grow tall to try and get above the neighboring trees, and resources are instead better allocated spreading as wide as possible. Finding an oak tree more than 2 meters wide in these parts is by no means hard, despite "our" best efforts to get rid of them. Also, a tree the size of General Grant would probably be best represented by 5x5 tiles at least.
One also has to take into account that a tree showing as 3x3 tiles in-game doesn't mean that it's 6x6 meters. It just means that that tree is large enough to reach well into all 9 tiles. And if we want trees that one can fit inside the trunk of (which realistically would work with a 1x1 tile tree) some measure of abstractation is required. I still agree with the general sentiment expressed that trees that wide may be a bit too common going by the initial preview screenshots, but it also depends a lot on which species of tree those were supposed to represent.
Edit: Almost forgot to add, my source for this is 3 years of biology studies specializing in ecology :>