Langasek announced via his blog that Upstart is now in Debian. This init daemon isn't becoming the default within Debian, but it's now available as an unstable package and will be supported with the forthcoming "Wheezy" release.
As Langasek says on his blog, "it's now possible to do meaningful head-to-head comparisons of boot speed between sysvinit (with startpar), upstart, and systemd. At one time or another people have tested systemd vs. sysvinit when using bash as /bin/sh, and upstart vs. sysvinit, and systemd vs. sysvinit+startpar, and there are plenty of bootcharts floating around showing results of one init system or another on one distro or another, but I'm not aware of anyone having done a real, fair comparison of the three solutions, changing nothing but the init system."
Steve's begun publishing some of his Bootchart results from the different systems here. On his blog he's begun providing some analysis between systemd and Upstart.
Upstart 1.6 was released earlier this month with new booting features. Systemd 196 was released last week and also brought new features.