Quote by selfAdjoint
It looks very interesting. ...
... Long exact sequences rule!
This is now turning into an exciting horserace! Early favorite SS Hope, who had seemed to flag around the far turn, is now showing champion style, challenging the leaders Causal Pride and Spin Foam as we come into the stretch! And don't ignore Asymptotic Freedom making a fine run, and dark horse Son of Phoenix coming up on the outside! The stands are going wild! Cheers and trash talk fill the air!

good imagery and rings true.
Motl blog attributes the development to Ovrut's team at UPenn and especially to Volker Braun.
so here is the latest from Braun and Ovrut, plus a list of papers that appeared earlier this year.
http://www.arxiv.org/abs/hepth/0510142
Moduli Dependent muTerms in a Heterotic Standard Model
Volker Braun, YangHui He, Burt A. Ovrut, Tony Pantev
23 pages
"In this paper, we present a formalism for computing the nonvanishing Higgs muterms in a heterotic standard model. This is accomplished by calculating the cubic product of the cohomology groups associated with the vector bundle moduli (phi), Higgs (H) and Higgs conjugate (Hbar) superfields. This leads to terms proportional to phi H Hbar in the low energy superpotential which, for nonzero moduli expectation values, generate moduli dependent muterms of the form <phi> H Hbar. It is found that these interactions are subject to two very restrictive selection rules, each arising from a Leray spectral sequence, which greatly reduce the number of moduli that can couple to HiggsHiggs conjugate fields. We apply our formalism to a specific heterotic standard model vacuum. The nonvanishing cubic interactions phi H Hbar are explicitly computed in this context and shown to contain only four of the nineteen vector bundle moduli."
2. hepth/0509051
Heterotic Standard Model Moduli
Volker Braun, YangHui He, Burt A. Ovrut, Tony Pantev
28 pages
Subjclass: High Energy Physics  Theory; Algebraic Geometry
4. hepth/0505041
Vector Bundle Extensions, Sheaf Cohomology, and the Heterotic Standard Model
Volker Braun, YangHui He, Burt A. Ovrut, Tony Pantev
62 pages, 2 figures
5. hepth/0502155
A Standard Model from the E8 x E8 Heterotic Superstring
Volker Braun, YangHui He, Burt A. Ovrut, Tony Pantev
23 pages
JHEP 0506 (2005) 039
6. hepth/0501070
A Heterotic Standard Model
Volker Braun, YangHui He, Burt A. Ovrut, Tony Pantev
12 pages
Phys.Lett. B618 (2005) 252258