Shell compatibility with Linux Bash

Hello,
I'm creating a complex shell script under Linux and I want it to be compatible with Solaris. The script will need to be source executed and hence does not use a "shebang" to specify the shell to be used.
I do not have Solaris available, but hope someone here could answer me a few questions:
What is the default command shell under Solaris, e.g. ksh, bash, solaris sh?
What shell is most commonly used?
I found the following link: http://linux.softpedia.com/get/System/Shells/Heirloom-Bourne-Shell-3043.shtml. It provides a portable variant of the traditional Unix shell. It has been derived from OpenSolaris code and thus implements the SVR4/SVID3 level of the shell. I'm not sure if this is good to test my script for Solaris compatibility, but it complied fine under RHEL 5.6.
So far I noticed the following compatibility issues:
$(...) command substitution does not work and I had to replace it with backquotes.
There is apparently no alias or unalias command. Is this correct?
The shell does not support variable arrays .e.g var[1]. Is this correct?
Thanks!
Update: I just found: http://www.softpanorama.org/Scripting/Shellorama/bash.shtml
Apparently Bash is default in Solaris. Is this correct?

Thank you very much for the replies. I installed Solaris 10 yesterday evening under Virtualbox and performed some tests using the default shell.
From what I can figure out, the /sbin/sh shell is default, at least for root. There are several differences from Bash:
The C and Korn shell like the variable array [] syntax, but Solaris borne shell doesn't. I will need to find a way around it.
I notice that echo -n to supress newline is not available, but echo "\c" works.
The alias and unalias commands are available, but I wonder how to make them work. I tried alias ll='ls -l' and unalias r, but it has no effect. Any ideas?
Unfortunately my script is going to set aliases and environment variables for the currently running shell, so I cannot use shebang and need to source execute the script. I wonder though, whether I should bother to support the default Solaris shell and simply make ksh or bash a requirement. Any comments are welcome.

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