I just checked in support for the above option into dpkg's HEAD branch. The output on this pipe is of the following form:
== (Reading database ... 38186 files and directories currently installed.) Preparing to replace kaiman 4:2.1-20010101-2 (using .../kaiman_4%3a2.1-20010101-2_i386.deb) ... status: kaiman: half-configured status: kaiman: unpacked status: kaiman: half-installed Unpacking replacement kaiman ... status: kaiman: half-installed status: kaiman: unpacked status: kaiman: unpacked Setting up kaiman (2.1-20010101-2) ... status: kaiman: unpacked status: kaiman: half-configured status: kaiman: installed == If so desired, I can also output which maintainer script is run, and with what options. ----BEGIN GEEK CODE BLOCK---- Version: 3.12 GCS d- s: a-- c+++ UL++++ P+ L++++ !E W+ M o+ K- W--- !O M- !V PS-- PE++ Y+ PGP++ t* 5++ X+ tv b+ D++ G e h*! !r z? -----END GEEK CODE BLOCK----- ----BEGIN PGP INFO---- Adam Heath <[EMAIL PROTECTED]> Finger Print | KeyID 67 01 42 93 CA 37 FB 1E 63 C9 80 1D 08 CF 84 0A | DE656B05 PGP AD46 C888 F587 F8A3 A6DA 3261 8A2C 7DC2 8BD4 A489 | 8BD4A489 GPG -----END PGP INFO-----

