The Maverick API is transport independent and therefore will support IPv6 as long as the java runtime supports it. If you construct a socket in java that has been created with an IPv6 Inet6Address then you can pass this into Maverick using the com.sshtools.net.SocketWrapper transport.

InetAddress addr = Inet6Address.getByName("::1");
Socket sock = new Socket(addr, 22);

SshConnector con = SshConnector.getInstance();
SshClient ssh = con.connect(new SocketWrapper(sock), "lee);

Detailed information on Sun's IPv6 support can be found here http://java.sun.com/j2se/1.5.0/docs/guide/net/ipv6_guide/index.html