I just tried this beta out (coming from 4.3.3) and i was unable to boot. I replaced the two files again from previous version and booted fine.
From the syslog of the 4.3.3 boot, it looks like it hung at these lines on 4.4.-b1
Sep 28 16:56:39 Tower kernel: sd 8:0:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Sep 28 16:56:39 Tower kernel: sdi: sdi1
Sep 28 16:56:39 Tower kernel: sd 8:0:0:0: [sdi] Attached SCSI disk
Sep 28 16:56:39 Tower kernel: r8169 Gigabit Ethernet driver 2.2LK-NAPI loaded
Sep 28 16:56:39 Tower kernel: ACPI: PCI Interrupt 0000:02:05.0[A] -> GSI 22 (level, low) -> IRQ 21
Sep 28 16:56:39 Tower kernel: eth0: RTL8169sc/8110sc at 0xf883a000, 00:1b:b9:f4:8e:f5, XID 18000000 IRQ 21
Hardware:
Main board: ECS AMD690GM-M2 AM2 AMD 690G Micro ATX AMD Motherboard
flash: SanDisk Cruzer Micro U3 1GB Flash Drive (USB2.0 Portable) Model SDCZ6-1024-A10
cpu: AMD Athlon 64 X2 5200+ Brisbane 2.7GHz Socket AM2 65W Dual-Core Processor Model ADO5200DOBOX
memory: OCZ Platinum Revision 2 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit
drives:
parity device: pci-0000:00:12.0-scsi-1:0:0:0 (sdb) ata-SAMSUNG_HD103UJ_S13PJ1MQ313654
disk1 device: pci-0000:02:00.0-scsi-3:0:0:0 (sdi) ata-SAMSUNG_HD502IJ_S13TJDWQ421406
disk2 device: pci-0000:00:12.0-scsi-2:0:0:0 (sdc) ata-SAMSUNG_HD501LJ_S0MUJDWQ241470
disk3 device: pci-0000:00:14.1-ide-0:1 (hdb) ata-MAXTOR_STM3500630A_9QG3M94Q
disk4 device: pci-0000:02:00.0-scsi-2:0:0:0 (sdh) ata-SAMSUNG_HD502IJ_S13TJDWQ421405
disk5 device: pci-0000:02:00.0-scsi-0:0:0:0 (sdf) ata-Maxtor_7L300S0_L603Q5PG
disk6 device: pci-0000:02:00.0-scsi-1:0:0:0 (sdg) ata-Maxtor_7L300S0_L603RCAG
disk7 device: pci-0000:00:14.1-ide-0:0 (hda) ata-MAXTOR_STM3500630A_9QG05CP4
disk8 device: pci-0000:00:12.0-scsi-0:0:0:0 (sda) ata-ST3500630AS_6QG3BL5H
disk9 device: pci-0000:00:12.0-scsi-3:0:0:0 (sdd) ata-ST3250410AS_6RY0Y4C9