SamsamTS
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This is probably because of the mipmap feature. It lowers the texture resolution based of the size it take on the screen. In the case of the leaves the pixels are either fully opaque or transparent (unlike the new stained glass texture which can be partially transparent) so when the resolution is lowered the computer have to decide for each pixel if it is opaque or not which in this case seems to remove most of the transparent pixels.
It can be fixed by turning off the mipmap feature (which you can do in video settings) or by allowing the texture to be partially transparent in the rendering code. I hope they change that but it might be heavier to render, leaves already have an huge performance hit as it is right now, it's especially noticeable in the jungle.
If your are talking about the textures being a bit blurred it's probably because of the new mipmap feature, it lowers the resolution of the texture based on the size they take on the screen. If the block is very small/far away no need to use a very big texture resolution and it helps reducing the noise.
IMHO it looks much better with it (look at the brick block) but if you don't like it you can turn off this option in video settings.
I noticed this immediately when trying the 13w05a snapshot : average fps drop and micro freezes (fps are not smooth anymore).
It was on a flat world with few layers of sandstone and NOTHING else.
I suspect the work done on the lighting of stairs being the cause of it : https://twitter.com/jeb_/status/296960097509330944
@BoxFigs
Well if you look at the glass block (not the panes which are 2D) you can clearly see it's a 8x8 pixels texture instead of 16x16, in fact all blocks looks like they have a lower resolution texture. Only mipmapping does that. Maybe it's a bug, a lower resolution texture is used where it shouldn't.
I wasn't able to reproduce it, well a little bit but it's not as bad as on your screenshot. Maybe the window size and GUI scale have an effect on it.