I am currently learning the workman layout, and I like it so far. I've typed Dvorak for 4 years (over 100 wpm), and have learned 2 other layouts (colemak & a modified carpalx). While it's much too early to make any conclusions about workman, I can say that I have high hopes for it. Many of you have immediately disregarded it, probably because colemak already meets your needs - which is great. Colemak is a fine layout. But I wouldn't be so quick to label it as pointless.
Shai brought up some good points, but many of them are non-issues for me.
1) ZXCV is not nearly as important to me as how well the layout flows under my fingers
2) Ease of learning is a valid point, although workman will be easier to pick up than dvorak
3) Same finger is about as good as dvorak. But not all same finger sequences are undesirable
4) Shift-capslock is a two-edged sword, but I tend to agree with Shai on this one
5) There are long sequences on the same hand. Time will tell if that is good or bad
6) True, yet I haven't encountered any that are awkward to type
7) The letter D is in one of the easiest keys to hit, for me.
8) A corpus is only as useful as your heuristics
9) The author has used it for 2 months and types about 70 wpm. *all* layouts have flaws (yes, even colemak)
11) Again, agreed. But just because he hasn't yet, doesn't mean he won't... the layout is very new
One of the reasons I didn't decide to stay with colemak is because it overloads the index fingers, and I found mine were in pain after typing all day. Another reason is that it never quite felt right. I felt some sequences were a lot harder to type than they should have been. Workman appears to address those concerns without sacrificing things I care about, but like I said, I won't know until I have reached a 60-70 wpm.
I'm not here to bash on colemak, or glorify workman. I just hate to see people disregard it so quickly when it appears to have a lot to offer.