Yesterday I update OpenBSD 3.9 on my laptop to the latest snapshot. Here is diff against 3.9 and 4.0-beta `dmesg':

-OpenBSD 3.9 (GENERIC) #617: Thu Mar  2 02:26:48 MST 2006
+OpenBSD 4.0-beta (GENERIC) #1055: Thu Aug  3 11:39:24 MDT 2006
-cpu0: FPU,V86,DE,PSE,TSC,MSR,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,ACPI,MMX,FXSR,SSE,SSE2,TM,SBF
-real mem  = 258449408 (252392K)
-avail mem = 228835328 (223472K)
+cpu0: FPU,V86,DE,PSE,TSC,MSR,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,TM,SBF
+real mem  = 258437120 (252380K)
+avail mem = 228171776 (222824K)
-bios0 at mainbus0: AT/286+(66) BIOS, date 06/29/04, BIOS32 rev. 0 @ 0xfd540
+bios0 at mainbus0: AT/286+(66) BIOS, date 06/29/04, BIOS32 rev. 0 @ 0xfd540, SMBIOS rev. 2.31 @ 0xdf810 (27 entries)
+bios0: Acer TravelMate 2300
-"unknown" at iic0 addr 0x18 not configured
-auich0: measured ac97 link rate at 48001 Hz, will use 48000 Hz
+auich0: measured ac97 link rate at 47998 Hz, will use 48000 Hz