From the change log......
What's new in v2.9beta1:
*) reduced disk space requirement by 50%;
*) improved ip firewall with many more matchers, chains in NAT and mangle
and more actions;
*) improved bridge firewall with more matchers, tables and chains;
*) increased speed of PPPoE, PPTP and L2TP connection creation, routerboard
can now handle 3000 active PPPoE connections;
*) router boots much faster even with lots of queues;
*) added more statistics to queues;
*) added support for multiple DHCP clients;
*) all PPP interface active MTU & MRUs are reported;
*) PPPoE server can have limit on maximum served clients;
*) added support for memory testing;
*) added support for full cpu loading (to test overheating);
*) multiple serial consoles;
*) possibility to increase visible screen lines in the console;
*) winbox now uses only one TCP port to get plug-ins and send data;
*) routes now support recursive nexthop lookup;
*) console help format reworked;
*) added Nstreme support for Atheros wireless;
*) added dual link Nstreme for Atheros wireless;
*) more 802.11g support for Atheros wireless;
*) hardware encryption support for Atheros;
*) AES encryption support for wireless;
*) added BOOTP client support in DHCP server;
Dan