If you stand in a 2 deep (or more) body of water, it is quite bright underwater (without Night Vision or Respiration enchant). There is also no distinguishable border between land/water.
It might be a new feature, but it could also be a bug.
Sorry if this issue has already been posted: I find it hard to find previous posts about an issue.
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Can confirm for 13w42b as well - can someone update that?
Also, can the description/title be changed to "Water and Lava are invisible from below the surface"? This isn't a transparency issue - the surfaces are simply flagged to not render at all, and it's a very glaring bug.
There is no visible water surface anymore when underwater. Also there is no "water fog" when underwater.
Experiencing this in 13w43a.
In 1.7 Pre-release there is still not visible water surface.
Confirmed in 1.7.1.
Can the version tags please be updated?

That ticket covers backface culling of all transparent blocks - Mojang may not want to revert their culling change for glass, but it's perfectly within reason to revert it for water. "Fixing" that bug would imply removing culling from glass, or implementing the suggested resourcepack change. Fixing this ticket merely requires removing the culling for water against air (and perhaps other non-solid blocks).
Note that water against solid blocks should still be culled - this is different from the other ticket, which accepts the possibility of rendering transparent backfaces against solid blocks and requires a full fix to z-fighting. Fixing z-fighting is entirely different from changing water's rendering settings.
I think this ticket should be left open, as the other ticket is broad enough to encompass more than one "partial fix". If you close this, you'll just end up with more duplicates of this, and if Mojang someday decides they don't want to completely rewrite z-fighting and rework their ideas of backface culling, that ticket may be marked "Works as Intended" or "Won't Fix" while this one would still be considered a valid bug.

MC-34751 is about improper use of backface culling, this is still a dublicate of it, it's one and the same problem caused by the "fix" of MC-34649. Regardless how Mojang fixes the issue, it would be better to have it summarized in one ticket instead having a ticket for every transparent block with missing backfaces. Any response of a mod would be helpful too (resolving or not?), at least there needs a "relates to MC-34751" added to this ticket!

Resolved by allowing players to see the surface of water from below. Beyond that, no further changes are planned.
Can confirm for 13w42b. Probably has something to do with whatever they did to the rendering engine to make it show only the forward faces of stained glass etc.